Find the directional derivative of a given equation at the point in the direction of the vector

3 a] Find the directional derivative of \phi=x^{2}yz+4xz^{2} at the point(1,-2,1) in the direction of the vector 2\widehat{i}-\widehat{j}-2\widehat{k}

Find the directional derivative of <span class="wp-katex-eq" data-display="false">\phi=x^{2}yz+4xz^{2}</span>  at the point(1,-2,1) in the direction of the vector <span class="wp-katex-eq" data-display="false">2\widehat{i}-\widehat{j}-2\widehat{k}</span>
Find the directional derivative of \phi=x^{2}yz+4xz^{2} at the point(1,-2,1) in the direction of the vector 2\widehat{i}-\widehat{j}-2\widehat{k}

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